Uninterruptible power supply



FIG. 1 is a perspective view of an uninterruptible power supply showing my new design;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a rear elevation view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a top plan view thereof;

FIG. 7 is a bottom plan view thereof; and,

FIG. 8 is a bottom perspective view thereof. 

The ornamental design for an uninterruptible power supply, as shown and described. 